High-luminosity stress-luminescent material
US6280655A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1999 |
| Grant date | Aug 28, 2001 |
| Priority date | — |
| Expiry date | Dec 22, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7734
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a high-efficiency stress-luminescent material capable of emitting luminescence by receiving a mechanical stress such as compression, shearing and rubbing. The stress-luminescent material is an alkaline earth aluminate of a non-stoichiometric composition deficient in the content of the alkaline earth element by 0.01 to 20% by moles from stoichiometry. The efficiency of stress-luminescence emission can be further enhanced when the non-stoichiometric alkaline earth aluminate contains 0.01 to 10% by moles of rare earth metal ions or transition metal ions. The stress-luminescent material is prepared by subjecting a non-stoichiometric composite oxide of aluminum oxide and an alkaline earth oxide to a calcination treatment at 800 to 1700.degree. C. in a reducing atmosphere.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.